Fahrenheit Sensor LM34 (CB14400E)

This circuit measures temperatures from +5 to + 300º F using a sensor from National Semiconductor not very easy to obtain.

Regulated Inverter (CB5145E)
The power transistors of this 80's circuit should have at least 10 A current collector and mounted on...
12V x 220V Inverter with 555 II (CB1297E)
The critical component of this circuit is the transformar. We found it in an 1980s documentation....
Telephone Pickup (CB12308E)
This circuit is from an Italian publication called Fare Elettronica from 1987. What we have is an...